On the Complexity Reduction of the Second-Order Volterra Nonlinear Equalizer for IM/DD Systems

Nikolaos Panteleimon Diamantopoulos*, Hidetaka Nishi, Wataru Kobayashi, Koji Takeda, Takaaki Kakitsuka, Shinji Matsuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)


To cope with the various nonlinear signal distortions in intensity-modulation/direct-detection transmission systems, a theoretical analysis on the Volterra nonlinear equalizer (VNLE) is provided, focusing on computational complexity aspects. The analysis yields a simple reduced-complexity scheme for the second-order VNLE (R2-VNLE) based on a performance-complexity tradeoff. An experimental verification is performed with single-sideband 28-GBaud PAM-4 signals, generated by an electroabsorption modulated distributed-feedback laser, over transmission distances of up to 80 km of standard single-mode fiber in the C-band. A comparison of the results for different equalization schemes, including a signal-signal beat interference mitigation technique, shows superior performance for the R2-VNLE.

Original languageEnglish
Article number8594656
Pages (from-to)1214-1224
Number of pages11
JournalJournal of Lightwave Technology
Issue number4
Publication statusPublished - 2019 Feb 15
Externally publishedYes


  • Direct detection
  • PAM-4
  • Volterra filter
  • intensity modulation
  • nonlinear equalization
  • optical interconnects

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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